I have made a ridiculously long meta post about Allen's origins/parentage/upbringing (http://vikki.livejournal.com/264377.html), which I believe may be relevant to your interests! =D It has spoilers through chapter 163 of the manga, though. >_>;;
But basically, my theory about Allen's parentage is pretty boring. Given that this would have been England in the 1880's, I suspect they were peasants, Allen was probably like their sixth kid, and then he was born with a deformed hand and they were like yeaaaaaaaah we do not have the resources to raise a child with a deformed hand LET'S GIVE HIM TO THE CHURCH. And then there was orphanage times. I don't think Allen's physical parentage is going to factor into the series in any important way, but as of now, with Allen being very much 'normal kid who had a lot of bad shit mojoed onto him', I'd say it's downright likely his parentage is boring and normal. ^^;;
Y HELLO THAR
But basically, my theory about Allen's parentage is pretty boring. Given that this would have been England in the 1880's, I suspect they were peasants, Allen was probably like their sixth kid, and then he was born with a deformed hand and they were like yeaaaaaaaah we do not have the resources to raise a child with a deformed hand LET'S GIVE HIM TO THE CHURCH. And then there was orphanage times. I don't think Allen's physical parentage is going to factor into the series in any important way, but as of now, with Allen being very much 'normal kid who had a lot of bad shit mojoed onto him', I'd say it's downright likely his parentage is boring and normal. ^^;;