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100 POINTS - help on sentence pls!

Does these sentence make sense,

1. Ich schicke der Brief nach meine Mutter.
2. Ich war acht Jahre alt wenn meine Mutter hat mir das Lanyard gekauft, und ich habe es acht Jahre lang.
3. Er schickt das Brief nach (his) Oma. (how do you say "his"?)
4. In mein Urlaub, bin ich nach Chicago gereist.
5. Ich habe mein Souvenir aus Chicago gekauft.
6. Es gibt ein Brief.

Also is Family a feminine? So do I use "t" or "en" or "e" when conjunction?
Like for example,
Mein Familie reitet pferde.
Do I use reitet? or reiten?

Not answer thoughtfully, I will report.