Re: Cannot feed toddler.

@DizzyDizzyDiana Hello!  Sorry you're having this problem in your game. 

EDIT: I should've asked if you tried having your toddler grab their own plate of food.  You can direct toddlers to grab serving whether a meal is on the floor or table or counter.  Also, can you check to see if your parent sims have any "introduction" options for the toddler?  There have been issues when a baby ages up to toddler, the parents need to be introduced for some reason.  This may be related to sims having the "beloved" trait.  Do your parent sims have that trait?

As for the issue of parent sims not caring for the toddlers, do you have any mods/CC?  If so, exit your game and then move the mods/CC files to another folder, maybe create a temporary folder on your desktop for them.  Then look in your file directory for the Documents / Electronic Arts / The Sims 4 folder and delete the localthumbcache.package file in there.  After that, open the game and load your household to see if the problem is still occurring.  If not, you can start adding back your mods/CC a little at a time to see which one is causing the issue.

If your issue is not related to mods, there are a couple open reports that I think are similar to what you described.

[OPEN] Parents refuse to care for toddler - Answer HQ (ea.com)

[NEEDS SAVES] My sims won't take care of their toddler - Answer HQ (ea.com)

If either of those are the same, please click "me too" on the first post. 

In the meantime, I have a suggestion for a workaround for the feeding.  Try having your toddler go into their bedroom (or any bedroom) and lock the door only for them.  Then drag a plate of food into the room and see if they'll eat it.  If they're upstairs or far from the kitchen, you can also drag the plate to their inventory and grab it from there to eat.  I know that's not ideal but at least this way it should keep anyone from coming and taking the food.

Please come back and give an update on how things are going!