I think its a very nice gesture that demonstrates a lot of respect for yourself, your lady and her family, and your future relationship.
It can also set the tone for your future interaction w/your in-laws. So, how you proceed will really depend on the specifics of your relationship.
Are you physically close to her parents? Does she have a good relationship with them? Do you? Will you enjoy their help as grandparents? What is your status relative to her father? Are you a professional in your own right? Is he? Are there cultural considerations you need to be making (are they a different culture from you?).
This site has various ages/culture/experience posting. Think about these things and get back to us.
Second thoughts can generally be amended with judicious action; injudicious actions can seldom be recovered with second thoughts.
--Cyteen by C.J.Cherryh