Gray, Peter B <br/><br/>
Do Step- and Biological Grandparents Show Differences in Investment and Emotional Closeness With Their Grandchildren?  [electronic resource] 

 -  Evolutionary psychology : an international journal of evolutionary approaches to psychology and behavior  Jan 2017 
 - 1474704917694367 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>1474-7049 
<br/><br/><label>Standard No.: </label>10.1177/1474704917694367  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Adult<br/>Female<br/>Grandparents--psychology<br/>Humans<br/>Intergenerational Relations<br/>Male