Any chance that one of the photographs was taken in a studio that might list its name and location?
Also, if any of your ancestors were married in a Lithuanian parish (I assume they were Catholic) in the U.S., you should try and get a copy of the church marriage register entry for them. It's likely written in Latin but would probably contain the place of baptism for the bride and groom as well as their parents names (with more authentic Lithuanian spellings). You need the copy and not an extract.
When I got the copy of my grandparents marriage entry, the church pastor apoligized for not being able to read it (poor cursive penmanship in Latin). I was more motivated than he was plus I knew what some of the words were already so I was able to translate it successfully.