Re: My Sim parents sometimes refuse to hug a toddler back :(
@TygerNight I agree that the meters and interactions could use some love for toddlers and parents - and others they interact with. I was very frustrated to realize on my most recent toddler (entirely done during the needs decay bug) that many of the interactions with the toddler were not bringing the 'attention' meter up. In my opinion, anyone from a child to other adult to parent who is interacting with the toddler or caring for them in any way should bring their attention meter up.
Though IRL entertaining and cooing and interacting with a baby/toddler can be 'not actually' fun/satisfying (sometimes it's solely for the benefit of the baby/toddler and the parent is burned-out or the caregiver doesn't really care, they're just being a warm body and keeping the kiddo entertained and cared for for money/obligation...) those types of subtleties in motive and emotion are far more subtle and nuanced than is appropriate for the game.
Imho I think it's best to make all fun/play interactions move up the fun and relationship for both parties, along with attention being brought up by every type of interaction the toddler gets - even if it's from a nanny, servo, butler, child, etc. That seems most accurate, logical, and fair.
And it's just plain wrong for anyone to refuse the hug of a toddler. The only exception I can see for this may be if it was a non-parent or non-household member or non-caregiver that had the 'mean', 'evil' or 'hates children' trait (but even for them I cringe at the thought of a hug refusal(!)).
A parent refusing a toddler hug is just plain unacceptable. If you see this happening consistently you may want to create a bug report: https://answers.ea.com/t5/Bug-Reports/bd-p/The-Sims-4-Bugs