fiancee visa ... is if ur planning to get married within 6 months validity of that visa.
if she's going to apply for a tourist visa , she needs proof thats she going back to the phils after the wedding or 3 weeks holiday with u in UK.
i don't know about u sponsoring the tourist visa and telling the UK embassy that she will attend ur son wedding.u might get lucky
so good luck and hope some people here can help u![]()