What would the social ramifications be if a Seeker Tia sired a child with a Keeper?

[Enkidoh]

I wouldn't really take F'lhaminn as an example of a 'mixed clan miqo'te' though, as her appearence of moonkeeper traits with a sunseeker name is simply a development error due to 1.0's muddled development which SE has simply retained or fixed with no explanation (to my knowledge).

If she was mixed clan it would be more likely she'd have fangs but cat eyes as well, which she doesn't - SE simply used the wrong character model for her naming traditions and never corrected it (or, alternatively, the racial naming traditions hadn't been correctly "settled on" by that stage so there might have been some drifting between appearence and name, with Oda and Koji-Fox only finalizing that canonically by ARR's development, hence leaving poor F'lhaminn as an anomaly).

Either way, for all intents and purposes from name she's a sunseeker, and from what I can tell is regarded as one narrative wise despite her appearence.