Since you have been w/them for two years, you will most definitely need them as a reference.
I certainly wouldn’t tell them what you just told us!
Make a very believable excuse & part ways on good terms if you can.
No need to burn bridges here.
It would also be a good idea to be a weekend date night sitter on occasion because that will show other families that they still like you enough to still use you on occasion.
That is only if you can stand it.
And it doesn’t contradict your story of while you left.
