Majority of guidance is that the children should be isolated for 14 days if they live with someone who is infected. You should follow local guidance.
In kind of a difficult situation with my children. 50/50 weekly custody split. Their mother got them yesterday and tells me 4 hours later that I need to pick them up because she has covid symptoms. It takes everything for me to not go get them but as I understand, conventional wisdom right now is to assume they are infected and not to spread it (leave them there). Youngest is 9 both children healthy. My girlfriend is also immunocompromised. Am I taking the appropriate precautions or is it better to get them out of there?