I am a similar situation as you. I have three kids and I don't shoot professionally. But I love the 5D3's. Used to have the original 7D and since going to 5D3, had to sell it (the 7D). I stopped using the 7D altogether and it was just collecting dusk. Since then, I'd been happy shooting with 5D3. The spec on new 7D2 looks great, but I would never let go of my 5D3. If anything, I would get a 6D or another 5D3. Full frame all the way for me.
I concur. The 7D managed to survive next to my 5DMkII (due to AF performance, not IQ) but the 5DMkIII killed it.