I love toddlers. And giving my kids siblings, depending. I personally love raising them. I love taking them to the park and stuff. Wish they had more beds and wish you could still take them for walks in the pram. I remember having a walking thing for them in sims 3 and it was probably the best thing ever. Saved me from having to teach them how to walk them myself haha.
Best thing for this I've found is... my main family has a butler and he takes waaay better care of my toddler than any nanny has ever haha. The nannys are so flawed. You'll go out after they get to your house, and your toddler will be red the entire time.