Yes - and no ! It depends on the context of the name.
Yes, you would use an apostrophe after "s" to indicate possession when referring to the house belonging to two grandparents. It would be written as "grandparents' house."
My father's house. The apostrophe shows that your father is in possession of the house.
Hobbs Brook Basin Gate House was created in 1897.
Neither, it would be written The Oswalts - with no apostrophe. Plurals don't need apostrophes. If something belongs to you, use an apostrophe. The Oswalt's house.
l
No, "relatives" does not have an apostrophe. An apostrophe is only used when showing possession or contracting words. For example, "relative's house" or "can't" for "cannot."
There should be an apostrophe s ('s) after Jullian, but there is no apostrophe s ('s) at the end of John:John and Jullian's house seems grey.
The house belongs to Dave. It should be Dave's house.
It is family's house. The apostrophe denotes a possesive and the house is possesed by a family, not by a familys.
Sometimes A den sometimes A tree
Some nouns that show ownership using an apostrophe are "couch's, house's, equation's", etc.
The address of the Abraham Staats House is: Po Box 115, South Bound Brook, NJ 08880-0115