Twice what Orlando gained is 2*5=<<2*5=10>>10 pounds.
Jose gained two pounds more than twice what Orlando gained for a total of 2+10=<<2+10=12>>12 pounds..
Half of what Jose gained is 12/2=<<12/2=6>>6 pounds.
Fernando gained 3 pounds less than half of what Jose gained, for a total of 6-3=<<6-3=3>>3 pounds.
In total, the three family members gained 5+12+3=<<5+12+3=20>>20 pounds at the reunion.
#### 20