I usually sit with my mom, and my dad sits in front of me!
I think this one is just a habit!
But if I eat with other friends, I always sit with my oldest, and best friend of them.
Talking about school issues during the dinner with my old friends, never gets boring.

"However, I say to you: Continue to love your enemies and to pray for those who persecute you," - Matthew 5:44
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I usually sit with my mom, and my dad sits in front of me!
I think this one is just a habit!
But if I eat with other friends, I always sit with my oldest, and best friend among them.
Talking about school issues during dinner with my old friends never gets boring.
= You don't use a comma before and when two adjectives describe the same noun.
= Among is the correct preposition when referring to someone within a group. 

= We usually omit the when talking about meals in a general sense.
= The comma after friends was unnecessary because it separated the subject from the verb. The subject is Talking about school issues during dinner with my old friends, and the verb is never gets. 
= This is wonderful!