I'd recommend having your lbs box the bike and ship it either to your aunt/uncle or a bike shop near them. Have the shop assemble and check out the bike before the big ride. Nothing like doing a two day ride only to have problems after 30 miles.
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The Lord is merciful and gracious, slow to anger and abounding in steadfast love. - Psalm 103:8
I am a cyclist. I am not the fastest or the fittest. But I will get to where I'm going with a smile on my face.