updated 08/07/2011 AT 6:45 PM ET
•originally published 08/07/2011 AT 7:00 PM ET
While handbag designer Vanessa Trump and her husband, Celebrity Apprentice advisor Donald Trump Jr., await the arrival of their new son in eight weeks, their two children are already getting to know their cousin – Ivanka Trump’s baby with husband Jared Kushner, Arabella Rose, who was born July 17.
“My daughter and son have both seen her. I’m very happy about that, because it’s good practice, to see how they’ll be when I have the baby in two months.” Vanessa told PEOPLE this weekend at East Hampton’s Blue & Cream store during a trunk show for La Poshett, a python-patterned handbag line that she designs with her mother and sister.