Grandma May was just short of saying Sheila was a granddaughter-in-law to her.

Since Alex had not voiced his feelings to Sheila, Grandma May worded it as if Sheila were already part of the family.

She was essentially telling Enid that the Yorks were pleased with Sheila. If Sheila were interested in Alex, they were ready to welcome her with open arms.

The social gap between the families was never a problem.

The Yorks never considered the Joneses lesser. Besides, the Joneses were doing well