How about Seri stopping distracting himself from the fact that he hates what he is by trying to find love outside himself. It would be a good idea for him to learn to love himself first, then he can truly start giving something good for his daughter.
I think it's evident by his general demeanour and his Quafe sponsorship that Seri already has loving himself down to a tee
On a more serious note, as for myself, not to sound melodramatic but I've lost six people extremely close to me, some of whom were blood relatives, in the last five years or so. Perhaps I can help.
My take on things would be simple given my own experience :
Seri is by nature very egotistic, and sees himself as one of the bigshots of the FDU. His personality is going to change, without a doubt. I'm no big shot and my personality and view on life has changed massively in the last five years or so.
Initially he'll probably go one of two ways, either his ego will take a massive dive and he'll end up in pieces for a while trying to figure out where things went wrong and if he could have stopped it, or he's going to go polar opposite and not want to show himself as weak.
If the first occurs, he'd be more than likely to stick out of the public eye, spend time with his daughter and do the good dad thing with a seriously protective watch over his daughter.
The second, I think his daughter would be treat the same, but Seri's temper would more than likely shorten with everyone around him, her included. He'd more than likely become more aggressive with those that challenge or antagonise him (i did this for a period before cooling off).
I think that regardless of what direction he goes in, he's going to be an overprotective father given losing one child, especially a son. To a man, in most of today's societies a son is the continuation of family tradition and passing on the family name to the next generation. It's his way to ensure that the family continues to thrive into the next generation and beyond, so I should imagine that Seriphyn would be very shook up over the loss of the little one regardless of how tough his ego paints him, this can only lead to him being more protective of his daughter.
As for the long term, who knows.
I could probably pile 101 pages of detail right here onto the forums, but it's a difficult thing to get across and I'd just end up sounding like an over-emotional gimp.
Feel free to drop me an evemail or something if you've got any specific question and suchlike. More than happy to help.