Ken and Naomi love their mother. She loves them (=Ken and Naomi), too.
Ken and Naomi love their mother. She loves them Ken and Naomi, too.
ケンとナオミは自分たちのお母さんが大好きです. お母さんも2人を愛しています.
I gave them two apples.=I gave two apples to them.
I gave them two apples.=I gave two apples to them.
私は彼ら[その人たち]にリンゴを2個あげた.
⦣ 最初のthemは動詞 （gave） の間接目的語. 後の them は前置詞 （to） の目的語. 