Somehow Hodgins is Jonathan Stanley Hodgins IV (meaning his great-grandfather was 1st or senior, grandfather was 2nd or junior, and father was 3rd) despite having an older brother named Jeffrey. Not unheard of, but uncommon for a man to name his second son a family name.
Bones asks Booth to deposit check for $75,000, which he can not do, since they don't have a joint account. She simply signs it over to Booth to deposit. Were he foolish enough to do this, he would have occurred a huge tax liability, having to declare it as "income."