hi there

This kind of feels like something I would ideally talk to my psychologist about but I get embarrassed really easily and don't want to talk about it out loud honestly.
My mom is in her 60s and she and my dad babysit my three year old nephew almost every weekday for a few hours at least. My mom is an obsessive person - her entire family is obsessive, and her children, including me, are obsessive - and recently she had surgery to have hemorrhoids removed and other related things, and this seems to have strengthened an existing obsession with literal ****.

I think I posted once before about her playing this weird game with my nephew where she was throwing a wet nappy onto a shelf and pushing it off repeatedly... I don't know if I'm just a prude but I have no idea why someone would want to make a game out of a wet nappy. She will have whole conversations with my nephew about ****, like picking up dog **** in the garden, which he now does all the time (which is sweet, but I'm kind of getting worried that he is getting really focused on ****), and she talks about going to the toilet all the time, and then sometimes she goes to the toilet all the time, like every 30 minutes. It just feels like many conversations get directed to talking about **** and toilets and related things. I've heard that older people get focused on this type of stuff but it's getting kind of disturbing. I'm feeling really uncomfortable going round there at the moment because it's bringing up really weird anxieties and I worry that this hyperfocus on **** and toilet habits is going to mess up my nephew.

I mean what I need to ask is: what is normal when it comes to talking about **** and toilet habits? (there are lots of things that I don't feel like I know what "normal" is) I feel like I can't ask my psychologist this because I have so much shame and embarrassment around these topics, which is probably why I find it so disturbing. I have struggled with sexual issues for a really long time and this type of obsession feels sickeningly like it could have been a trigger or something. I have no real idea.