[R] drawing a network digraph

[Vumani Dlamini]

Dear R users,
I have a matrix with 2 columns with the variables: "daughter index", "mother 
index". I would like to draw a network digraph using this data, where each 
daughter is connected to a mother and between the connections inlcude a 
circle with the information on the indices ("daughter index", "mother 
index"): i.e. something similar to graphs produced by graphviz.
I am clueless. I have looked at the libraries SEM and SNA but it looks like 
they can't help my cause.
Hope you help.
Vumani