Well you mention some type of lever or jack, that sounds fine but until
now no one mentioned pulling the broken joist together before sistering
it. Maybe just a strong ratchet strap would pull it together? Whatever
works. Just do it BEFORE sistering it!
Before I did that I would make 2 cuts through the break about 1" apart
so the two pieces do not touch when pulled back into place. When you get
the correct length temporarily screw a 2x2 on the top side of both
halves to keep the truss true (keeping the ratchet strap in place).
Once you sister the truss on both sides (glue it and screw it) you can
remove the 2x2 and strap... and Bob's your uncle!
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