J.S.
A.
It sounds like something may have happend while your Mother
was takeing care of him not saying she did anything wrong
but a bathroom can be a scary place if its in someone elses
home how did your Mom aproch the training you need to ask
I'm sure she did all the right things but start there & it may be something els but I know when my 2 year old grandson
is at my house he won't go into my bathroom alone don't
know why but he won't thats why I said you need to ask
your Mom how the potty thing went while she was sitting him.
God Bless & god luck J.