You've got two effective options. Pay them to leave. Pay someone else to make them leave.

Why do you think there are so many fires here?

Unfortunately, those squatters will never leave. The government protects them because they vote for the corrupt politicians who give them money. Your mom should rethink whether she really wants to build a resort with squatters out front as a 'selling point'. It doesn't matter that you own the land and they don't. None of that matters. They'll be there forever. You'll just have to accept them as a feature of your resort. I'm not even being sarcastic. Thirty years ago my family bought land with squatters by the entrance. We were told they'd eventually leave once more houses were built, but 30 years later they're still there.

Point out to the Barangay Captain the financial windfall he'll get from the resort, and put him and the tanods on your payroll. Offer their family's kids some well-paid jobs, but only on the condition that they start moving the squatters on. Then release a few pythons into the neighborhood.

Didn't you see the squatters when you bought the land? Did you leave the land unattended for years? Unfortunately, squatters have rights I'm 100% against squatters' rights, but I also think you should have protected yourself to avoid problems like this. Also, I'm sure you could just hire some thugs for 10k to get rid of them for you

When I lived in Latin America, we had something called the Colombian Collection Agency. They collected debts and set things straight. There's got to be something like that here. One warning: don't take it lightly. You'll become part of the clan.