Thank you for your reply.My grandmother (daughter of Lucy Maine, daughter of Myron) had cousins in Wick, IA.Her mother used to visit the grave of "Uncle Loddie", who died young.I assume this is the group you mention.
The other group are all half siblings of Myron, through his father Loderick's 2nd marriage.There was contact with them through my grandmother's generation.
Anne Eliza Beard and Thomas Beard were siblings.I've never found documentation for this outside of family tradition and a family letter from Thomas Beard, to Loderick in which he mentions family members, including his mother, sister and another brother-in-law.
I'd love to find out more about her.
Anyway, I appreciate your contribution and interest.