Yonko that we all knew..

Oda mention to us that there are FOUR Yonko that rule the sea..
Those FOUR are the strongest Pirates that exist after Pirate King..
Becoming Pirate King is what most of the Yonko want to achieve in their life..

But right now..
Oda did mention to us about two out of FOUR Yonko to us..
Let put aside of BlackBeard..
Let us look on the FOUR Yonko mentioned earlier by Oda which are Whitebeard, Kaido, Big Mom and Shank..

So..
Let us focus on WhiteBeard and Big Mom..
We first met WhiteBeard when MarineFord arc is presented to Us by Oda..
The arc where we lost Ace..
The same arc we lost WhiteBeard too..
The arc where BlackBeard begin to fit himself as the new Yonko..

Then..
When Sanji was kidnap and bring to WCI..
The journey take Luffy and half his crew to meet Charlotte Rinrin a.k.a Big Mom..
Here Oda show us who Big Mom was..

Let us talk more on the conflict that both WhiteBeard & Big Mom..
i. Family
- WhiteBeard has no family but his crew members were his family.. He appreciates them all.. Maybe he got a son or a daughter in the past.. But Oda still don't want to talk about WhiteBeard's past.. Maybe in the future episodes we could get a hint on that.. Yeah.. Many theorist out there did speculate Sir Crocodile is WhiteBeard's only children.. A son or maybe a daughter to WhiteBeard.. But what I want to talk about is WhiteBeard or his name Edward Newgates was the Strongest Pirate as he and Roger (Pirate King) become friend in the past.. He take care of his crew members a lot as he sacrifices himself at MarineFord just to save Ace (one of his Division Commander) that been caught by BlackBeard and will be judge at MarineFord by Marine (World Government)..

- Big Mom has a lot of children on her own by making love with more than 40 husbands.. But did she care for them..? Oda did show that Big Mom used her children as her own pawn.. She treats them as her army.. In her normal state, she don't really show her love toward them.. And in her craving symptom.. She doesn't care to take the lifespan out from them.. All her children fear her all the time..

ii. Enemy
- As we all know that WhiteBeard died in MarineFord.. He just not died but also betrayed by his crew member: BlackBeard. So the real enemy for WhiteBeard is not just World Government but his own men.. It started when BlackBeard kill Thatch just to get a devil fruit that he knew.. Then he sold Ace to World Government just to become Warlord.. After that he aimed for WhiteBeard's title as Yonko.. Although WhiteBeard care and love his crew members.. One of them turn to be a thorn and betrayed him..

- For me, Big Mom controlled all his crew members (children) and because they all fear her.. She easily can manipulate them.. What if.. Inside of Big Mom Pirates existed one thorn that want to take over Big Mom's title as Yonko..? Because they fear that Big Mom could easily killed them or get their lifespan away.. So they plan to kill Big Mom and become the new Yonko..

So..
This is just my little thought on those two Yonko: WhiteBeard & Big Mom.. One love to be call as Father to all his crew members and one perhaps real mother to her crew members.. And I would like to see Oda elaborates more on other Yonko as Shanks and Kaido.. Perhaps for BlackBeard too..