Not sure if you know but Umar was a keeper for 5th ODI although he is not a natural keeper but he kept very well. Seems like these brothers are genetically keepers.
In total these Akmals are 6-7 and all of them look very similar and among the cricketering brothers Umar is most talented batsman.
When Kamran started to play cricket (not international) he was a specialist batsman and took keeping role to come into the side.
On the other hand Adnan is a keeper naturally and is better than Kamran who himself says this.