Unfortunately I didn't have time to search for other siblings. I think next summer I'll have more time- this 10 days in Mass is pretty busy & I picked up a nasty cold from a family friend's baby yesterday but I'm aiming to be up here for about 6 weeks next summer! Good news is I got my sister kind of sucked into the genealogy and she plans to go to to UMass Boston next fall which is right near the Mass Archives & Vital Records Archives.
On the 27th my mom, sister & I will have about 90mins/2hrs at the state Archives which are 1841-1920. If there's any b/m/d's you want to find out about, let me know! There were 900000000zillion Fitzgeralds in MA; beat out maybe by Smiths and Sullivans but wow... a lot! Anyhow I have a list of births, marriages, deaths to look up while we are there so I can add to it easily.