Step 1: Create a 10-foot radius around you at all times. Any invasions within this perimeter are strictly forbidden.
Step 2: Wear a Hazmat suit to dinner. It's not that far-fetched, trust us.
Step 3: Bring an escape plan. Know the nearest exits. Have a backup plan for when the in-laws inevitably corner you in the kitchen.
Step 4: Practice your 'I'm fine, really, it's just the flu' face. You never know when it'll come in handy.
Step 5: Bring snacks. You're not going to survive on their mediocre cooking.
Step 6: Develop a love for awkward silences. You might as well just be a hermit.