Timeline for purchase of Property?

Task
Agree to purchase
Pay refundable deposit? How much? How it is protected?
Or not necessary?
Or not done in the Philippines?
Create Sales & Purchase Agreement (SPA)
Sign SPA
Start Title Transfer?
Pay remainder? Keep all or some back until Title Transfer complete?
How is seller protected if paying now?
Seller’s mother to get court document giving power of attorney for children - this gives TIN number?

Or should remainder be paid here after court document is obtained?
How is seller protected if paying now as title still not transferred?
Seller pays Capital Gains Tax & obtains Certificate Of Payment Of Tax from BIR

Question
Or should remainder be paid here after court document is obtained?
How is seller protected if paying now as title still not transferred?
Seller pays Capital Gains Tax & obtains Certificate Of Payment Of Tax from BIR



Question
Should a holding deposit be paid before SPA is signed? If so, how is refund guaranteed if sale cannot proceed?
When should final payment be made? If before title is transferred, how if buyer protected?

Your questions are unintelligible.