My dad and I have issues whch i wont go into as that will be an essay by itself. But we are trying to get along and are civil to each other. 2 days ago he took 2yo ds out for the afternoon and after getting back volunteered to bath him. I told my dsis to tell him not to use soap to bathe ds (ds is an allergic sort and we only use soap sparingly, about once a week). He ignored my dsis and used soap. I was unaware of this.
Yesterday I noticed a rash on ds's creases and suspected he had used soap. I questioned him and he says my dsis didn't pass on the message. I questioned dsis and she said she told him, but he said ds would smell without soap and proceeded to ignore her. They are both coming for dinner today. Aibu to bring it up and start an argument if it transpires that my dsis version is correct and my dad chose to ignore my wishes, and then lied about it??