It appears Harry & Elizabeth Roberthsaw came to the USA sometime between their marriage in Dec..1899 but before the death of their oldest child Lily who died & was buried in Pa. in 1900.
Harry's father-in-law, Thomas Whitehead, was born in Pendleton, Lancashire, England, United Kingdom. Elizabeth (Whitehead) Robertshaw, was buried in Wilkensberg, Alleghany, Pa. in 1927
DOES THIS SOUND LIKE YOUR ROBERTSHAW FAMILY TREE?
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http://familyhistorymoments.weebly.com/robertshaw-family.html