Grandfather
/ð/
feather
/ð/
third
/θ/
Fifth
/θ/
think
/θ/
Thumb
/θ/
Mother
/ð/
those
/ð/
Father
/ð/
mouth
/θ/
They
/ð/
Fourth
/θ/
this
/ð/
these
/ð/
Grandmother
/ð/
the
/ð/