I've been going in circles for a couple hours and figure it's time to ask others for help. :)
I initially believed, based on census records, that the father of Abraham Marder was an Abraham "Harry" Marder. The JewishGen burial record for Abraham changed my mind, since that says Abraham's parents were Shlomo and Ada. Also, a Ukrainian Jewish family with a son named for his living father obviously just didn't make sense to me.
But allll of the records continue to lead me back to "Harry" being the father -- it just seems inescapable at this point.
Normally I'd just chalk the one outlier record up to being a fluke and ignore it, but there's still that problem of an Abraham having a son named Abraham...what do we think?