You should love your sister.
You should love your brother.
You may be a sister.
You may be a brother.
You could become a sister.
You could become a brother.
If you do not have a sister.
If you do not have a brother.
Look around you;
I am sure you can find a sister.
I am sure you can find a brother.
If you still cannot find a sister.
If you still cannot find a brother.
Do not give up.
Someone may be looking for a sister.
Someone may be looking for a brother.
Relatively speaking they will be looking for you.