'Arrive last obvs. You don't want to cause trouble in the car park.'
But maybe though you should enter the church/venue just before the bride (when the music begins) as it would be rude to be after her & therefore late (v rude!). Obviously walk elegantly & gracefully down the aisle (think gliding slowly & serenely & you have it) as rushing to a seat is unbecoming...& also go right up to the top....after all you are family & likely there will be a seat just waiting for you. 🤣