Explaining marital problems to children
Question

How can I explain to my little children the problems I have with their father, without that having any negative impact on their psychology and character? Please note that we are separated but not divorced, because of his neglect, indidelity, lying and stealing.
Praise be to Allah.There is no benefit in telling your children about your problems with their father, especially when they are very young and Allah may guide and rectify their father, and your life may become stable and happy.
Our advice to you is to avoid openly speaking of the problems in front of them, so that it will not affect their psychology.
If anything of that nature is required, then you can speak in general terms, such as saying to the one who asks you: There are some circumstances that prevent us from getting along, or that prevent us from living together, and other such excuses.
When the children grow up and reach an age where they are able to understand that, then they will understand what is happening, and that such things – and worse things – often happen in life.
So long as the matter has not reached the point of divorce, then who knows? Perhaps Allah will guide him and enable him to repent, and he will come back to you and to his children.
And Allah knows best.