Which altcoin is best suited for sending remittances to family back home?

You can pretty much use any altcoin to send money across borders. That is really not the issue. The problem you will face is loading/off-loading of funds from the Altcoin.

Sender: For a person to send money, they would need to find an easy (read: economical) way to buy altcoins.

Receiver: For a person to receive the money, they would need to find a smooth way of cashing out from altcoins to the native fiat.

It is the problem on the latter that is more of an issue than there are solutions for.