Apply for legal Guardianship

Hi Atty.
My brother and his wife got separated 4 years ago, and since then hindi na nakita ng mga pamangkin ko ang mommy nila. My brother lives with my mom with his kids and my mom is helping him to raise the kids and helping him financially with their education and other needs. Can my mom be the kids' legal guardian? The reason behind is, I'm planning to give my mom and the kids a 4-day vacation in Hongkong. I checked the DSWD requirements and seems that it's impossible to get a letter from my sister-in-law allowing her kids to travel abroad since we lost contact with her since she left my brother. Hope you can help me bring my nephews' dream to visit Disneyland in reality. Thank you in advance!

a legal guardian is appointed by the court. the father can try to apply for a solo parent ID and then he alone can sign the letter allowing the children to travel

Thank you attyLLL. Pwede ko po malaman how to apply for a solo parent ID? Thanks again

http://www.officialgazette.gov.ph/services/solo-parent/