 Some researchers believe that this occurs because frightening behaviours are more compatible with the father ’ s play-mate role than they are with the mother ’ s role of providing comfort when the child is distressed.
<fluency>  Some researchers believe that this occurs because frightening behaviours are more compatible with the father ’ s play-mate role than they are with the mother ’ s role of providing comfort when the child is distressed.
 Some researchers believe that this occurs because frightening behaviours are more compatible with the father ' s play-mate role than they are with the mother ’ s role of providing comfort when the child is distressed.