You can apply your sister in law under your name as family visit visa only for 6 mos but can be extended until 7 mos it depends on the mood of the immigration officer . Seek letter from your company stating that you want to apply visa for your sister in law. Go to main immigration along with your passport copy & RP, your wifes RP and her birth certicate and also your marriage contract to prove that your sister in law and your wife are really siblings. Then once you got the visa go to Philippine Embassy and apply for affidavit of support since it is one of the mmigration requirements back home. Hope this will help your query.
You can apply your sister in law under your name as family visit visa only for 6 mos but can be extended until 7 mos it depends on the mood of the immigration officer . Seek letter from your company stating that you want to apply visa for your sister in law. Go to main immigration along with your passport copy & RP, your wifes RP and her birth certicate and also your marriage contract to prove that your sister in law and your wife are really siblings. Then once you got the visa go to Philippine Embassy and apply for affidavit of support since it is one of the mmigration requirements back home. Hope this will help your query.