Shouldn't do. Just buy a small network switch put it somewhere that makes getting cables to it from the end points required as easy as possible. The end points being the modem router, sons PC, your and wifeys laptops and possibly an access point.
Just run a cable from each endpoint back to the switch and plug into a free port, same for the cable from the modem/router. These days switches and devices automatically sort themselves out, no need for uplink ports or crossover cables.
You need more practice. Strip 1 1/2 to 2" of outer jacket off, untwist each pair starting with orange, green, blue, brown and flatten/position each wire into the correct order forming a dense, flat and parallel set of wires fairly close to where they merge from the jacket. Trim straight across just over 1/2" from the jacket maintaining the formation. Slip into plug making sure that each wire slides fully down the right hole, crimp.
Note that there are two types of plug or rather the IPC part. One is designed for stranded (patch) cable the other for solid (installation) cable.
Not that I've had any problems with the stranded type on solid cable. But these are all connections that once pluged in stay that way for months if not years.
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