graph {
graph [splines=ortho, nodesep=1]
node [color=white]

ff [label="isoisä"]
f [label="isä"]
fb [label="setä"]
fs [label="täti"]
m [label="äiti"]
c [level="lapsi"]

subgraph cluster_level0 {
label = "Ensimmäinen polvi"
labeljust=l
ff
}

subgraph cluster_level1f {
label = "Toinen polvi"
labeljust=l
f
fb
fs
}

subgraph cluster_level1m {
label = " "
labeljust=l
m
}

subgraph cluster_level2 {
label = "Kolmas polvi"
labeljust=l
c
}


ff -- f
f -- c
m -- c

}