Tim has 2 brothers and 1 sister. His oldest brother, Jaime is good looking and looks NOTHING like Tim. He's a pretty accomplished builder in the area. Including his pic below. If you know their last name, you can Google him and his LinkedIn, website, etc.
Then Adam is the other brother and used to be in lots of vlogs (including hosting the urban party).
Here was a pic I could cut / paste from his FB page of his wedding years ago -
Their mom and dad used to be in vlogs too - more their dad than mom but nevertheless, Tim would vlog about his dad getting his hand cut, them going out to eat, etc. Adam and his wife and kid (or kids, but I know he has at least one bc Jenn and Tim did a clickbait-y title years ago with a newborn baby in the thumbnail and it was Adam's) live in Seminole County, as does Tim's parents (pretty sure Lake Mary for the parents).
No mention ever of the sister. Not sure what happened w/ her. I think her name is Susie?
I'm 99% sure the reason for no mention of family is that Jenn had Tim essentially pick between them and her.
Also regarding the nanny. The people on Guru seem obsessed with the nanny idea. In reality, I think it's just the girl from Disney Double Dose that hangs out with them sometimes to "help" with Jackson (because I guess it's so hard to vlog and take care of your only miracle child

at the same time )
You can see the girl from DDD in one of the last vlogs they filmed at EPCOT before COVID-19 closing. You can see Jenn stuffing her face and talk with her mouth full (sorry, but that's what she legit does) and, in the background, the DDD girl is holding Jackson and Jackson is looking toward his parents. Broke my heart.
I really don't think Jenn would allow a live-in nanny or even a part-time nanny (by the basic definition of the word) to come into their house on a regular basis. You know, because they're superstars and need their privacy.
So that's why I think it's just a friend (or two) they're using for free help who also has an AP.