Steve and Danny are together. Steve had a child at 16 with Catherine,Kaleah. She has stayed with Steve since she was born as Catherine works away so she never really sees her.
Steve:27
Danny:27
Kono:27
Chin:28
Lou:30
Kaleah:11
"When I lost my wife, I never thought I'd be happy again. I got lucky when your kid met mine."
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in which Danny Williams's son and Steve McGarrett's daughter start dating and funnily enough, so do their parents.