～たち・～ら
Refer to a person and their group
You'll be able to use たち and ら to refer to groups of people or to a person together with others associated with them.
蓮たちは公園でサッカーをしています。
rentachi wa kouen de sakkaa o shite imasu.
What do you think this sentence means?
Ren and his friends are playing soccer in the park.
Refer to someone and their group
～たち and ～ら can refer to several people or a person with associated companions. 蓮たち means Ren and his group, not several people all named Ren.
私たちは明日出発します。
watashitachi wa ashita shuppatsu shimasu.
We leave tomorrow.
Form and use ～たち・～ら
たち is widely useful with people. ら is common in forms such as 彼ら and 僕ら, but is not interchangeable with たち everywhere: あなたら can sound rough. Neither ending is a general plural marker for objects.
私たちは明日出発します。
watashitachi wa ashita shuppatsu shimasu.
We leave tomorrow.
彼らは同じ学校の生徒です。
karera wa onaji gakkou no seito desu.
They are students at the same school.
私たちは来週、京都へ旅行に行きます。
watashitachi wa raishuu, kyouto e ryokou ni ikimasu.
We're going on a trip to Kyoto next week.
子どもたちが学校の前でバスを待っています。
kodomotachi ga gakkou no mae de basu o matte imasu.
The children are waiting for the bus in front of the school.
彼らは毎週土曜日にサッカーをします。
karera wa maishuu doyoubi ni sakkaa o shimasu.
They play soccer every Saturday.
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