Since three weeks ago, I am going to yoga with my ex sil (we are good friend and I get on well with ex family) once a week. The first time I asked my 16y old son to mind my 8y daughter. When I came back home at 9pm daughter was outside my son did not look after her at all , I wasn't happy with it. Rang my ex sil to tell her that I won't be doing yoga anymore and explain why. She said to go to yoga with her and that her mom (my ex mil) will mind my daughter. Came 2nd week, drop daughter, went yoga, everything was fine no issue daughter watched TV with her grandmother, no bother. 3rd week when I came in ex mil asked why my son is not minding my daughter and it upset me and has been on my mind all the time since. I struggle with depression since my marriage broke up, I don't go out much, their dad only takes them during his designated time, if I ask him to look after them outside his designated time, he always tell me he cannot as not available and he is entitled to his free time. For him, when I have them it is my responsibility to sort them out,. But on his side when he booked holiday during his designated time and he doesn't take the kids he just tell me he is not available. Ex MIL fully know the situation so it did upset me her comment especially when herself and my sil was telling me not to give up yoga. I only ask them to mind my daughter when I don't have a choice which is very rare.