As salamu alaykum sister,
May Allah reward you for your diligence in teaching your children Islam. It sounds as if they have a solid foundation in their Islamic beliefs as they are praying and fasting. While you did not mention their ages, this is a blessing alhumdulillah.

As far as your husband goes, insha’Allah over time once he sees how Islam has benefited his children as well a his wife, he may insha’Allah begin to practice again. We never know how our actions will affect others so insha’Allah make duaa for your husband that he returns to practicing Islam. As long as you have the children rooted in Islamic activities and friends, insha’Allah they will not be “spoiled” by their father’s lack of practicing and may indeed one day also encourage him in a loving way to practice as well. While nothing is guaranteed, and we are tested in this life, you have given your children a wonderful start by planting the seeds of Islam in their hearts, insha’Allah it will continue to grow.

Make duaa to Allah SWT that they are protected and guided down the right path and are strong enough to not be affected by those around them who do not practice.

Your in our prayers sister please let us know how you are doing.