Family and relatives of Friedrich Wilhelm (William) Mueller and Anna Gulinski, originally from West Prussia/Poland (Thorn/Torun). They emigrated to the US in 1904 and lived in New Jersey until the mid-1950s.
There are several copies of this photo loose in Anna Mueller's album and elsewhere. Edw Mueller's notes on one copy read "about 1905-6" and my notes read "Anna, William, TC and Angela" based on family communications. Theodore (TC) was born in 1902 so this is probably earlier than the 1905-6 date assigned by Edw Mueller.