Which form to use in this context

If I'm telling a parent "Have a nice weekend." Do I say "Que tiene un buen fin de semana" or "Que tenga un buen fin de semana" or "Ten un buen fin de semana"?

And if it's more than one person, is it "que tienen" or "tiene"? This ten, tenga, tiene stuff confuses me. 😞

submitted by /u/KawaiipieUwU
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