i have some questions about their child

She adopted the little boy. He was Lucia and ex-crown prince's child (Lucia ended the main story pregnant in the monastery). I think he was adopted as an infant so Alexandra was his mom for his entire life and it's all he knows.

They could've gotten the vows before the ceremony, you know? It was mentioned that Gerald was involved in the crusade so maybe they got married before that, just in case, you know, the unmentionables happened to him and the kingdom lacks a legitimate heir. Since he succeeded with the mission, the kingdom could be having a festival plus public wedding.

Of course, this is just speculation. I'm sure the novel (there's a novel right?) has the exact reason why.

ooohhhh that makes a lot more sense i wish they explained that a bit more in the manga (or maybe they did and i somehow just completely missed it ajdhsb)

that’s a good point! ngl kinda forgot in some cases you can legally get married without having the whole ceremony ajdhahdh also yes there is a novel!! it seems like it actually has a decent amount of details that are a bit different from the manga

Here in my country for most of the religions, we can just get married with the vows, either at respective religions' houses or at the bride's home with only selected few people available. Marriage ceremony is mostly for the sake of propriety, to show to everyone that you got married, it's not something to hide.

During the co*** period, a lot of our locals got married with just the vows, because, you know, social distancing. That's why when public events are finally allowed, sometimes the ceremony can have two or three siblings married at the same time! It's because some of them are already married during the pandemic, so they just share the ceremony to save money.