Should she travel and leave her sister who cannot take good care of herself?
Question

                I am an unmarried muslim woman living in Germany. 

The islamophobia is rising here. But alhamdulillah I now have a chance to live in Malaysia with my son. 

There I can live my religion better in sha Allah. Here in Germany I am taking care of my 53 old muslim sister who lives alone in a flat but has contact to other muslims. She is suffering from a serious lack of independence since childhood. She oftenly behaves and thinks like a child and the matters of everyday life are a real challenge for her. 

When there is no help from others my sister is sometimes able to act more or less independently but it is not so easy for me to estimate when that is the case. If I would leave her alone she will probably not be able to handle her live. She has a muslim son but the relationship between both is not the best and he himself has many problems in life. If I leave Germany one of my two muslim daughters will still be here living close to my sister but it might be a heavy burden to take care of my sister. (My other daughter lives about 100 kilometers away from my sister.) There could be a chance for my sister to live in Malaysia in the case that her son studies there. But he has (as far as I know) not done serious steps until now to study there. My non-muslim parents asked me before they died to take care of my sister. I can't remember that I said to them: "I promise it!". Probably I said, that they shouldn't worry. 

Is it okay for me to go to Malaysia? What do you think?
Praise be to Allah.
	Firstly:

	If someone in a non-Muslim country becomes Muslim and is able 
	to practice his religion openly, and does not fear pressure or temptation 
	that could make him drift away from his religion, then there is nothing 
	wrong with him remaining there. But if he finds another country to which he 
	can migrate, where he will be able to practice his religion openly and carry 
	out the rituals of Islam in a better manner, then it is recommended for him 
	to do that.

	But staying in his own country may be preferable, if he can 
	focus on calling people to Allah, may He be exalted, and spreading 
	knowledge, especially among his family and relatives. 

	It is not obligatory to migrate except when two conditions 
	are met:

	i.
	
	When the Muslim 
	is not able to practice his religion openly, or he fears pressure or 
	temptation that could make him drift away from his religion. 
	

	ii.
	
	When he is able 
	to migrate; if he is not able to do it, then it is not obligatory in his 
	case.

	For more information concerning that, please see the answer 
	to question no. 47672.

	Secondly:

	There is nothing wrong with you going to Malaysia and living 
	there with your son. You do not have to stay with your sister, and it does 
	not seem to us that she really needs you, because she can take care of her 
	own affairs, and she can seek the help of the Muslim women she knows, and 
	your daughter can visit her from time to time.

	You should keep in touch with her, ask after her and visit 
	her whenever possible, so as to uphold the ties of kinship, as is 
	obligatory, and so as to fulfil your parents’ request to take care of her.

	We ask Allah, may He be exalted, to make what is good easily 
	available to you wherever it is, and to bless you with the reward of 
	upholding ties of kinship.

	And Allah knows best.