Provenance gives the gift a bit of weight. Lily O'Brien's has handcrafted its chocolates in Newbridge, Co. Kildare since 1992, so a large box arrives as something made with care rather than grabbed off a shelf. It is a detail worth mentioning as you hand it over, since a gift that comes from somewhere specific always feels more considered.
Keep the gift aimed at the adults, personalise it for the day, and check the detail before you order. A named box of chocolates handcrafted with a bit of provenance behind it marks a christening or an announcement in a way that feels chosen, and it gives the parents something that is unmistakably for them.
One honest point that applies to any recipient. If he asks about ingredients or dietary suitability, point him to the published product information rather than reassuring him yourself.
Personalisation is worth thinking about early. A printed message, a monogram or the wedding date turns a nice box into a keepsake. Ask what the personalisation actually involves before you commit, since some options print onto the sleeve and others onto a card insert, and the two photograph very differently across a long table.
Thank you is the most common thing a gift has to say and the easiest to get slightly wrong. Too small and it reads as an afterthought. Too large and it puts the recipient under a strange obligation. A mid-size chocolate collection or a share bag sits in the right register for almost every version of the occasion.
What is inside should hold its own. Lily O'Brien's Ireland O'Brien's has handcrafted its chocolates in Newbridge, Co. Kildare since 1992, so the box is a genuine gift for the adults rather than a token wrapped around a name. That matters at an event where the parents are tired and the attention is all on the child.