The Hob  - bit to be released in about a year is in two parts. OMG -talk about a stretcher. To be fair Tolkien did write four books w/ history of Middle Earth  - Men  , Elves, Dwarves and all the other critters.
Thus, there can be references for almost all the characters.
Simple relationships such as Gimli from LOTR , the son of Gloin ( one of the dwarves in TH ). The Company in TH do visit Elrond ( of the quote " I was there three thousand years ago, when the strength of men failed " in LOTR ) and the Last Homely house.
But how they'll squeeze a women into this, w/ a shoehorn for sure.
Bilbo is 50 when he sets out in TH as was Frodo in LOTR.  I think both share the bloodline of Belladonna Took. (?)
Gandalf is there.