If you're the eldest, you probably got promoted to 'third parent' at age nine with no salary and no lunch break. You fill out forms, translate at appointments and somehow know everyone's passwords.
Retirement doesn't mean you stop caring. It means you start delegating. Teach your sibling to book the flights. Let Dad figure out the TV remote. Allow people to struggle a little. It builds character (theirs, finally).
Your one job this week: hand back one responsibility that was never yours. Then go and eat something warm.