My kids are 4 and 6.
My ex has/had an SO, they are breaking up. She is a licensed daycare worker. I have never met her. But I know he leaves the kids with her sometimes.
A) I am relieved that they like her.
B) Relieved there is another adult in the home ( he drinks ).
C) Not threatened, they have a mum, me, other positive role model adults are a good thing.
Me: mid 40s female
Mr Dom: late 40s. 6 months
Prof: 50s. 3 years.