You can only change ONE letter, AND/OR rearrange the letters currently available. The first word is:
WINS
@ 912, confirmation, Cris is right, sister-in-law is "saali"
lair
hair
hard
@ 914 But you must have heard of Aunt Sali? Lol!
harm
:P
harp
path
oath
thou
tout
pout
soup
soap
pose
post
oust
stud
stub
bout
tube
duet
duel
lewd
well
welt