You know, all that really matters is that the people you love are happy and healthy. Everything else is just sprinkles on the sundae.

This quote means that the only things that really matter in life are having people that you love to be happy and healthy. Anything else that happens, like achieving success or owning nice things, are not as important but are just extra nice things to have. It’s like putting sprinkles on a sundae – they may add a nice touch, but without the ice cream, the sundae would be incomplete.