Thanks for your question. What nationality are you, what is your immigration status in this country, is your wife in the UK and if so what type of visa is she here on?
Your wife will need to apply for a spouses visa from the Philippines. She must apply using form VAF1F (available for download from HOme Office UK Border Agency website) .
She will need to prove that you are a married couple (eg. marriage certificate), that you are settled here (ie. as a brit national), that you intend to live together in the UK, that you can support each other without recourse to public funds and that you have suitable accommodation either owned by you or lived in by your household.
The son will be British National by virtue of your citizenship, so he will be able to apply for a British passport straight away if you can prove you are the father (eg. birth certificate, paternity test if not).
If you want to give your wife the best chance of coming here then I would instruct a immigration lawyer or practitioner to prepare, or at least check, your application. If it is refused then I would certainly instruct a solicitor at that point to act on your behalf.
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