Hi,
Thomas Forster, the father, is lodging with a Swinburne family at Beamish in 1891.
His future wife, Mary Ellen Thompson, is with her Heatherington grandparents a Beamish Forge in 1891.
It looks as if Mary Ellen died in 1902 and it may also be that Thomas died before 1911 as it looks as if the children are with various relatives in 1911. Apart from John Robert, who you already know about, I can see Alfred with a relative in 1911.
Let me know if you need the 1891 references and Mary Ellen's death.
mim