Markov Blanket
Context
Markov Blanket selects the nodes that belong to the Markov Blanket of the node on which you opened the Node Contextual Menu. The Markov Blanket of a node is defined by its Parents, its Children, and its Spouses (the co-parents of its children). Together, these nodes make the node conditionally independent of all the other nodes in the network.
Usage
Highlight a node, bring up the Node Contextual Menu, and click Select > Markov Blanket. The nodes in the Markov Blanket of the highlighted node are now selected.