Could someone provide an example of a tx spending from an input with a relative LockTime?
If you look at https://blockstream.info/address/bc1qdv0fk4c73fem89s708pzdny8q25d7k5nrckckp87c8alwaw803fq3mqrpz you will see that there are two transactions. 

The first one  https://blockstream.info/tx/943f18e17aa2ba716f2d13785268a1bd6b25c39d2718f3b4785559a5eeaba883 is the funding TX to open the payment channel included in block 587093 (at least according to what was send over gossip) 

The second one https://blockstream.info/tx/a175425ee2f3c01acc97ef32ab1082db14eaa94e5af4c54f02f3b01dec72558e is the force closed timelocked commitment tx included to block 587314

The output 0 of the commitment tx has a relative timelock and was self spend / sweeped with this transaction https://blockstream.info/tx/0be2b9a3a6a9dc99443d6ce7bd3beaf33c713a4938af3bf0fec1e918257bbd32 which was included in block 588801

If you decode the transaction you see nothing special

304402204a54d94068512c22847cc07fa85f2b93feaf758411920a9b20ce9b85831e8aa5022005924cb82c331c5173e21477a4d8298eb25c0d967ace065b883455f2537c3d0a01 &lt;empty&gt; 632103f96d73ffe138690f032e97408af933a71782ad27a28df66a750b48c56b2d7fa96702cf05b275210304f332f50363cd01b679d9fb50fb8691fb0fb638737867bd02f06850c6191a2268ac

p2wsh witness script
OP_IF OP_PUSHBYTES_33 03f96d73ffe138690f032e97408af933a71782ad27a28df66a750b48c56b2d7fa9 OP_ELSE OP_PUSHBYTES_2 cf05 OP_CSV OP_DROP OP_PUSHBYTES_33 0304f332f50363cd01b679d9fb50fb8691fb0fb638737867bd02f06850c6191a22 OP_ENDIF OP_CHECKSIG

nsequence
0x05cf

previous output script
OP_0 OP_PUSHBYTES_32 c9452fef6bd1c72c8648d6ac78ce552543a1e5bf80a470fb259ff670aa5ced26 (v0_p2wsh)


However you can observe the nSequance = 0x05cf which encoded in decimal is 5*256 + c*16 + f = 5*256 + 12*16 + 15 = 1487

As the commitment tx was included in block 587314 the timelocked spend from it would have been rejected any block earlier than 587314 + 1487 = 588801 which was exactly the block height of the third tx.