It sounds like there are a lot of factors to take into consideration (including what country you want to raise your children in and their educational opportunities in each place).
I can understand not wanting yourself or your children to be around negativity towards your religion, especially if they are living in a country where Muslims are the minority, and it is already difficult to be a practising Muslim/raise children as practising Muslims. From that angle, since you would not be receiving religious support from your family, it is good to consider whether there is a supportive, healthy, and welcoming Muslim community there to offer support for yourself and your children, especially in teaching children about Islam in a positive and appealing manner.
Probably there are pros and cons to staying where you are, or moving. There may be some hidden blessings to moving there but also some challenges. So it is good to consider all aspects (financial, religious, educational, social, emotional, etc) and make the best decision.
Possibly this may be situational, for instance, if your mother is at an old age and if you are concerned that she will pass away while you are not present and you would regret that, that might be a factor.
There is probably no rush to make a decision and sometimes when we give something time, Allah decides for us by changing the circumstances of our life to go one direction or the other. When unsure, it is good to pray for guidance, as it often comes clearly.
In any case, silat al-rahm can be done regardless of where you live and does not require living nearby especially these days when travel and communications are much easier.
