と (with)
with (a person)
Person + と + verb
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After a person, と means "with": 友達と映画を見ました, "I watched a film with a friend". It's the same と that joins nouns, doing a neighbouring job.
Some verbs need a partner by nature and take と for them: 結婚する (marry), 話す (talk), けんかする (argue). 田中さんと話しました is "I talked with Mr Tanaka".
Add 一緒に for "together": 家族と一緒に住んでいます, "I live with my family".
For the thing you do something with, a tool or a means, it's で, not と: 箸で食べる. People take と; things take で.
Examples
友達と映画を見ました。
I watched a film with a friend.
週末は家族と出かけます。
At weekends I go out with my family.
先生と話しました。
I talked with my teacher.
姉は来月、アメリカ人と結婚します。
My sister is marrying an American next month.
母と一緒に料理を作りました。
I cooked with my mother.