He's called your uncle becasue your mother's sisters are your aunts and the people married to them are your uncles (assuming that they're men).
Mother's Day is important because it is the one day of the year when we focus on mothers. Mothers tend to give and give and give to their children and husbands. Mother's Day is a special day when we can give back to them and make them know how special they are and how much they are appreciated.
Most mothers have the baby because they love their husbands and want to share that love with children.
If mother is singular: mother's If mother is plural: mothers'
Mothers is more than one mother. Mother's is something that belongs to a mother. "The mothers group is meeting Tuesday." "My mother's car is in the shop."
When referring to more than one mother, the correct form is "mothers." If you want to indicate possession by multiple mothers, you would use "mothers'." The form "mother's" is singular possessive, indicating something that belongs to one mother.
The plural is mothers-in-law. (not mother-in-laws)
The possessive form for the plural noun mothers is mothers'.Example: The mothers of several students have formed a mothers' committee.
Divorce
Mom
The difference is the placement of the apostrophe. "Mother's" with an apostrophe before the "s" is possessive, indicating something belonging to one mother, whereas "mothers'" with an apostrophe after the "s" is possessive, indicating something belonging to multiple mothers.
You would use "mothers" for two, as it is a plural noun.
The plural of the noun mother (female parent) is mothers.