Nancy,
Couples are named 1,2,..., 16; 4 weeks as follows for houses A,B,C,D, etc:
A: 1 2 3 4
B: 5 6 7 8
C: 9 10 11 12
D: 13 14 15 16
1 6 11 16
2 7 12 13
3 8 9 14
4 5 10 15
1 8 11 14
2 5 12 15
3 6 9 16
4 7 10 13
1 5 9 13
2 6 10 14
3 7 11 15
4 8 12 16
This "solution" has couples 1 and 11 at the same house in weeks 2 and 3. I don't see complete solution to your problem.
Denis
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