If Allie's bowl contained two more grapes than Rob's bowl, there were 25+2=<<25+2=27>>27 grapes in Allie's bowl.
If Allyn's bowl contained four more grapes than Allie's bowl, there were 27+4=<<27+4=31>>31 grapes in Allyn's bowl.
The total combined number of grapes in all three bowls is 25+27+31=<<25+27+31=83>>83 grapes.
#### 83