Say yes with clear, written terms
Try, 'I can lend 300 today, and I’m comfortable with repayments of 100 on the first of each month, starting next month. Let’s text to confirm dates so we both remember.' Naming an exact amount and schedule offers security for you, predictability for them, and a shared record to reference later, preventing memory gaps from morphing into tension, confusion, or uncomfortable silence at family gatherings.