WHITEBEARD and him alone.....
As stated above , he was not a real father .(Well saying that may be an insult to his Epicness and quality, morals and values he depicted) , but yeah, he did go with a war for a single child against the whole world.He loved them all equally . He gave them the freedom they desired , the name WB and always believed that his fame and power everything was due to his sons but when actuality was quite different.
His only desire was the family and nothing else when he easily could have been PK. But, he did not . He not only loved his own commanders and his grp as his sons but all of the allies of WB as his sons too and was willing to go as far as he could for his sons..
He took the actions of ACE as his own order and did not let his son feel ashamed in front of the world.
The best example is HIM FORGIVING SQUARDO like nothing happened , just saw it as the mistake of a child when it was a grievous injury and also reason for most of the time his strength failed.....So, who is better than such a parent ?
Except DADAN & BELLMERE , all of them whatever they did was for their own blood and flesh . But no one has gone as far as this man has gone.So, No one is better choice except only this man WB.
Just hats off to WB .