Short answer: Banks want to see you saved the deposit gradually. Gifts count partially. Sudden lump sums may need explanation.
Banks want to see that you saved the deposit yourself over time. It proves you can handle mortgage repayments. Gifts from family count but only partially. A sudden large deposit from selling a car might raise questions. Build your deposit gradually in a savings account.
Saved Monthly: $500 x 12 months = $6,000
Family Gift: $10,000 (declared)
Inheritance: $5,000 (with will documentation)
Total: $21,000 — all traceable and acceptable