I can't do any more research on my family till I can travel and I can't do that right now.So I hunt down local people for the fun of it.
There is a cemetery south of Davison called Pine Grove which has some Seeleys in it.If you like, I could go over there and see what's there.It's only a couple miles from me and I do enjoy getting out.I could also take pictures of them for you if you like. There was a site for it but I can't find it now.
I wonder if your Harrison Seeley was just named after his uncle.I have found that occasionally.
I just saw a Pierce A Seelye b. 1856 living with Harrison and Denzia in 1870.There is also a Pierce A Conger 1844-1847 son of Harrison & Denzia - on their obelisk.Looks like that is another name in common.