Back to the Islington Youngs - one of the sisters was Margaret and we know that the brothers all went to USA at least for a while.
on 1911 there is a Margaret Young, widow, b Liverpool age 29 (so right age for this Margaret) lodging with a Makin family in Kirkdale, Liverpool. She has 2 young Youngs (ha!) with her - Margaret, age 5 and Mabel age 1, both "american residents".
relevant to this family?