Hi Eduardo - I think you get the prize for ambition, but I would urge caution with this - it would be a challenge for anyone including native English poets. Twisting the grammar is generally a sign of a desperate or lazy writer (usually a concession to rhyme or scanning and I see that's not the reason here). So, depending on the rest of the song, I think you need to be consistent and deliberately poetic all through to maintain this.
The first two lines do have an epic ring to them - you might be OK there, though "had" is not a poetic word and I think a classical scholar would choose another verb. Again, in the last lines you have the verb "to be" (was x 2) which is really prosaic sounding.
And finally, "Mum" is a real problem - it's so modern and un-epic it feels like it doesn't belong here.
But who knows. It sounds like you're not writing a fluffy song the lyric will be a big part of this and deserves plenty of attention to be the best it can be. Give us the full lyric or demo and I'm sure you'll get useful and honest opinions back...