Use the top-level ratio 6:5 to find how many guests from the bride's side and groom's side there are, then break each group down using sub-ratios.
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• Top-level ratio 6:5 means 11 units in total.
• 99 ÷ 11 = 9 per unit.
• Guests from the bride's side: 6 × 9 = 54
• Groom's side: 5 × 9 = 45
For the guests from the bride's side (sub-ratio 2 + 7):
• 9 parts = 6 per part
• family: 2 × 6 = 12
• friends: 7 × 6 = 42
For the groom's side (sub-ratio 3 + 2):
• 5 parts = 9 per part
• family: 3 × 9 = 27
• friends: 2 × 9 = 18
Total family: 12 + 27 = 39.
Check: 54 + 45 = 99 = total (99). ✓
Final Answer: 39