When Annah gets hurt feelings she always wants to make up after or looks or reassurance.  She'll come up to you and give you a hug and say "I love you too!"  She always adds the "too" even if you don't say anything before.  
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When I tell the kids "I love you" they say "I love you too".  Then I say "I love you three, I love you four (..sometimes adding, "I love you more").