Reflective Plural?


I learned that ofter the word "que" you should use the subjective. I am confused about the correct grammar here. I want to say to an older person "I am happy to know you liked them." "them" refers to a gift and it is plural.

For now I have:

Que alegira me da sabre que le gustaron.

Is this correct? Is so, the verb "gustar" is in agreement with which subject? How can I write this with "vos" or is vos les formal than "usted"?

submitted by /u/sonofacyborg
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