Weddingbee boards

I have 2 direct bosses of equal importance, R & A. 

I sit right in front of R's office, and we talk all the time.  I've met his entire family, gone to Mets games with them and he & his wife had us up to their summer house last year.  His 5 yr old daughter always runs to see me when she comes in to visit, and his older daughter send me a congrats letter from camp when he told her I got engaged. 

While I've worked for them both the same amount of time, I'e never met A's family though I've talked to his wife on the phone a few times.  They've never come to the office holiday parties, and he's never introduced me when his family has stopped by the office (his office is down the hall around the corner, so I didn't even catch a glimpse of them)

I live (and work) in NYC but will be getting married in our hometown of Pittsburgh, PA which is a 90 min plane ride or 7 hr drive away.  My question is:  should I invite them?  Both, just R or neither?  If it were a local wedding I'd aboslutely invite R and prolly still A; however with the travel required to attend, I'm afraid of appearing gift-grabbing by inviting them to a wedding I'm 99% sure they won't attend.  Of course, because R and his whole family have been so excited about our engagement, I'm afraid it'll appear rude if I snub them.  Then, if I do invite R, because he and A are both my equal boss, I'm afraid it'll be considered rude to leave him out.

Advice?

Thanks.  I guess I should add that I work for a PE firm with ppl that are literally on the Forbes 500 list as the wealthiest ppl in the world; I hear them complain about being solicited for money ALL THE TIME.  I'm just afraid inviting them knowing the won't come will seem like I'm asking for $$.