My daughter is due May 30 and the sex of baby is unknown. She has a daughter Addison Philips Hopes (Addie), born 2008. If she has a boy it will be Robert William Hopes III. Nicknames are possible , Trey, Trip, Will or Liam, none of which they really like. If it is a girl they are having trouble finding one they both like. A few possible are Taylor, Reese, Payton. She likes Mackenzie, Tori, Emerson, Ansley. They would like to use the middle name Lynn a family name but it sounds very country with some first names. Could you give suggestions for boy nicknames and girls names.
Is "Rob" already taken by her husband? That's my favorite nickname for Robert. I also like the old nickname Robin, but in my area that cause confusion with the girl's name. I know a baby Robert who goes by Bert/Bertie, and it's surprisingly adorable. But I think in this case, if Rob is what the dad uses, I would use William/Will: it's simplest, and William is a great and currently-well-liked name. They don't love it, but this is one of the main problems with Sr./Jr./III stuff: generally it's a name the parents wouldn't have otherwise chosen, so there's bound to be a "meh" feeling about the choice. That will likely fade as whatever nickname they choose BECOMES their darling baby boy and doesn't even seem like a name anymore.
Girl name possibilities:
Some of the names on this list wouldn't work at all with the middle name Lynn: Braelyn, for example. I included them anyway in case your daughter and son-in-law change their mind about the middle name, or in case they want to use it as part of the first name instead (Braelynn, Jaelynn).