Maddie Bush Brown, estranged daughter of polygamist Kody Brown, has just told fans she’s expecting baby number four. Sister Wives has been giving us an insight into the life of polygamist family the Browns for 19 seasons now. With the patriarchal head of household Kody Brown having eighteen children across four wives, this brood keeps growing in size. One more addition to the big family is on the way as Kody’s estranged daughter Maddie Brown releases an announcement she’s expecting another baby on Instagram. Maddie Brown’s expecting baby number four This lineage just keeps on expanding! Maddie…