Would you be able to post your bitcion address that you found to have some balance on an explorer? If the transaction is brand new, it could take some time for the node that is connected to your wallet to display that there is indeed a transaction coming your way. What wallet are you exactly using, and are you sure that the address you're looking at is the same as what your cousin saw on the blockchain? If you could give these details, that would be a great help.
cryptonator is the wallet I'm using and below is a transcript of what came up when I searched my wallet address on blockchain.info
Summary
Address 18jy8Qn6oHH1fGPF1STDwFzgcniwaqwxAe
Hash 160 54e93437aa501f584e8ec37c8cc94ff0a92497ab
Tools Related Tags - Unspent Outputs
Transactions
No. Transactions 30
Total Received 0.09046983 BTC
Final Balance 0.01712129 BTC