Can bad karma be created and paid back in the same lifetime My father was mentally very unwell. As a result my mother worked to support her children. We grew up embarrassed by my fathers behaviours and effectively excluded him from our lives even though he still lived in the house with us. To be fair though, he was not capable of interacting, mostly staying shut in his room during the day, and living nocturnally.  My mother who was a very kind person found solace by having a relationship with a married man whilst my father was at home . On leaving home, marrying and having my own children, I became reflective and angry and confused so for a short while I cut my mother out of our lives. Now, my own children grown, have done the same to me. Am I witnessing Karma in action? Does Karma that’s played out in the same lifetime mean that you won’t have to carry the consequences into you next lifetime? I see so many examples of direct cause and effect in my own life that I hope that if I deal mindfully with my feelings as a result, that I am paying Karmic debt now .. not in future reincarnations. Is this possible?
Sue. While I am not suggesting you write an auto-biography, your post is lacking in information. However, making assumptions based on what you wrote and offering mere speculative examples based on what you wrote: 


Your mother was probably lonely and without support. 
Having an affair with a married man was possibly a way to have a relationship or gain some companionship and physical affection without the perceived threat of a committed relationship that impinged upon her family and a duty of care she felt she had towards her disabled husband. 
If you cut your mother out of your life because she had a affair with a married man, this can be perceived as both reasonable and unreasonable. 
HOWEVER, IMPORTANTLY, you should list or define (to yourself) the reasons why you cut your mother out of your life because these are the actual causes of why you cut your mother out of your life. 
You should then list or define the reasons (to yourself) why your own children cut you out of their life. 
These reasons could be related to the mental attitude you had for cutting your mother out of your life; such as you having a lack of forgiveness, a lack of tolerance, being demanding, having a lack of understanding, being morally overzealous, etc. 
Or the reasons for your children's decision could be due to their own unwholesme mental attitudes. 
The point is the reasons &amp; causes are either your mental tendencies, your children's mental tendencies or a combination of both. 
Buddhism teaches various mental attitudes &amp; behaviours are either: (i) wholesome; or (ii) unwholesome. 
If you get angry a lot or criticise a lot, this can be unwholesome. Therefore, others may reject or avoid you for this. 
In summary, its all about current attitudes, habitual tendencies &amp; behaviours rather than past &amp; future lives. 
Therefore, if you have habitual unwholesome qualities that are not changed; the same rejection from others may occur in the future.