Good morning Kim- I concur with the other comments listed below. Timing is everything in RE; if you have to wait because of someone else and you lose a great deal, its you loss- not the listing agents.
On the surface, this Pelham home looks like a very good deal- especially if you're in the market for a home with an in-law. There are not many like this one- so you'd need to get something moving, in my opinion.
If you need any help with preapprovals or anything like that, please feel free to contact me. Thanks and good luck,