Can I connect my wired laptop to the a public hotspot through a router, or through a wireless laptop?

I'm at the beach, and the house has wi-fi. My siblings have laptops with wireless cards and can access the internet. I have an old laptop which does not have a wireless card...I have a router with me. Is there some way I can plug into the router, and have it connect to the wireless network already here? Or... show more I'm at the beach, and the house has wi-fi. My siblings have laptops with wireless cards and can access the internet. I have an old laptop which does not have a wireless card...I have a router with me. Is there some way I can plug into the router, and have it connect to the wireless network already here? Or can I just connect my laptop to one of my siblings, and have access?
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