They will probably be forgotten together. When the first one is forgotten, the second one will probably no longer be valid, so it will be dropped from mempools as well.
Thanks for reply What happens with the second transaction if the first got confirmed? How does it look like, if the transaction appears in the blockchain and be forget afterwards? Can I see something under the TXID, when the transaction were forget?
For now, your first tx can still be found on some relay nodes, which also means it is still in the global mempool. If somehow your tx with so low fees get mined (which seems pretty much not possible at least for another 25 blocks), the same would apply to your second tx if it is still broadcasted by some nodes.
If you tx id ends up getting dropped of the global mempool, it should no longer be searchable even with full indexed nodes. Your second tx should also be forgotten along with it.
Ultimately if both are forgotten, your btcs would be spendable again.