There are efforts by screenwriters by Stephen Chbosky («The Perks of Being a Wallflower») and Evan Spiliotopoulos («The Huntsman: Winter's War») to provide emotional links between Belle and her Beast involving their mutual absent mothers that don't add much substance. (rogerebert.com)
Companies were then ranked based on how high they scored on APCO's «Emotional Linking Index,» which gives brands a grade out of 100. (canadianbusiness.com)
From a different perspective, another reason that may be linked with this outcomes is that contact with biological parents may discourage both the child and the foster parent to get more emotionally involved as it can place biological parent in «first place» differing on them the main emotional link. (link.springer.com)