How to write the title of the main family members' relationship

The titles of major family members can be filled in the following ways:

1. Dad: Short for Dad.

2. Mom: short for mom.

3. Father-in-law: the abbreviation of father-in-law.

4. Mother-in-law: short for mother-in-law.

5. Elder sister: a title of respect for elder sister.

6. Brother: the abbreviation of brother.

7. Brother: the abbreviation of brother.

8. Sister: short name for sister.

The above are some common appellations of family members, I hope they can help you.