Their father tells them to pray and adhere to the teachings of Islam but he does not pray
Question

                my dad knew every thing about what do you have to do to be a muslem, and he always tell us to do what god ask us to do and he always tell us or show us the right way and he love the god he always tell us to pray and fast everything that make god yerdah anna , but he never did them and never say anthing bad about the islam and he want everybody to be a muslem , but he never pray or fast or anything like that ; what do you call that ? what should we do ?
Praise be to Allah. 
          Firstly: 
 
          It is not permissible for your father to neglect prayer, 
          because neglecting prayer is kufr (disbelief). See the answer to Question 
          # 2182 and 10094.
 
           Secondly: 
 
          Your father must beware of the consequences of this action, 
          which is that he is telling others to do what is right but not doing 
          it himself, and forbidding them to do what is wrong but doing it himself. 
          There are severe warnings to those who do this. 
 
          It was narrated that Usaamah ibn Zayd said: “I heard 
          the Messenger of Allaah 
          
          (peace and blessings of Allaah be upon him) say, ‘A man will be brought 
          on the Day of Resurrection and will be thrown into Hell, where his intestines 
          will be spilled out and he will go around like a donkey goes around 
          a millstone. The people of Hell will gather around him and say: O so-and-so! 
          What is wrong with you? Didn't you use to order us to do good deeds 
          and forbid us to do bad deeds? He will reply: Yes, I used to order you 
          to do good deeds, but I did not do them myself, and I used to forbid 
          you to do bad deeds, yet I used to do them myself.’”
 
          (Narrated by al-Bukhaari, 3027; Muslim, 5305) 
 
          Thirdly:
 
          Your duty towards your father is to try your best to 
          call him (da’wah) and tell him that it is obligatory to do the prayers, 
          with wisdom and beautiful preaching. Your eagerness to guide your father 
          is one of the greatest ways in which you can honour him. You have to 
          be patient when doing that, and strive hard in making du’aa’ that he 
          will be guided. 
 
          Remember the story of Ibraaheem (peace be upon him) and 
          his father, who was calling him to shirk, and how Ibraaheem replied 
          to him and was kind and gentle in the way that he spoke to him. 
 
          And remember the story of Abu Hurayrah with his mother, 
          and how keen he was to call his mother and guide her to Islam. Perhaps 
          (these stories) may encourage you to strive in calling your father. 
 
          It was narrated that Abu Hurayrah said: “I used to call my mother (to 
          Islam) when she was still a mushrikah. I called her one day and she 
          said something about the Messenger of Allaah 
          
          (peace and blessings of  Allaah be upon him) that upset me. I went 
          to the Messenger of Allaah 
          
          (peace and blessings of Allaaah be upon him), weeping. I said, ‘O Messenger 
          of Allaah, I was calling my mother to Islam and she refused. I called 
          her today and she said something about you that I upset me. Pray to 
          Allaah to guide the mother of Abu Hurayrah.’ So the Messenger of Allaah 
          
          (peace and blessings of Allaaah be upon him) said, ‘O Allaah, guide 
          the mother of Abu Hurayrah.’ I left, feeling hopeful because of the 
          du’aa’ of the Messenger of Allaah 
          
          (peace and blessings of Allaah be upon him). When I got home, I went 
          to the door and found it slightly ajar. My mother heard my footsteps 
          and said, ‘Stay where you are, O Abu Hurayrah!’ I could hear the sound 
          of water. She bathed and put on her garment, and hastened to put on 
          her khimaar, then she opened the door and said, ‘O Abu Hurayrah, I bear 
          witness that there is no god but Allaah and I bear witness that Muhammad 
          is the Messenger of Allaah.’ I went back to the Messenger of Allaah 
          
          (peace and blessings of Allaah be upon him) weeping with joy. I said, 
          ‘O Messenger of Allaah, Allaah has answered your prayer and guided the 
          mother of Abu Hurayrah. He praised and thanked Allaah, and said good 
          words. I said, ‘O Messenger of Allaah, pray to Allaah to make me and 
          my mother beloved to the believers and make them beloved to us.’ The 
          Messenger of Allaah 
          
          (peace and blessings of Allaaah be upon him) said, ‘O Allaah, make this 
          little slave of Yours – meaning Abu Hurayrah – and his mother beloved 
          to Your believing slaves and make the believers beloved to them.’ No 
          believer heard of me or saw me but he loved me.”
 
          (Narrated by Muslim, Fadaa’il al-Sahaabah, 4546) 
 
          May Allaah help us all to do that which He loved and 
          which pleases Him.