How do I draw a tikzpicture inside of a child node of another tikzpicture?

Question

how do I embed a binary tree inside of a child node of an already existing binary tree, like such

I've been using tikzpicture to draw the trees this way:
documentclass[12pt, letterpaper, oneside]{article}
usepackage{tikz}
begin{document}
    [
    begin{tikzpicture}[nodes={draw, circle, fill=gray!20}, --]
        node{19}
            child {node{25}
                child[missing]
                child{node{28}
                    child {node{32}}
                    child {node{93}}
                }
            }
            child [missing]
            child[missing]
            child {node{20}
                child{node{89}
                    child{node{99}}
                    child[missing]
                }
                child[missing]
            };
    end{tikzpicture}
    ]
end{document}

Taken Spark · Accepted Answer

Through the help of a friend, I've managed to come up with a not so hard solution for this tree, I hope it helps someone:
documentclass{article}
usepackage{tikz}
usetikzlibrary{shapes.geometric}
begin{document}
    flushleft
    begin{tikzpicture}
        [square/.style={regular polygon, regular polygon sides=4}]
            node at (0,0) [circle,draw] (a) {4};
            node at (5,-3) [rounded corners, draw] (c) {
                begin{minipage}{0.4textwidth}
                    begin{tikzpicture}
                        node at (0,0) [circle,draw] (a1) {8};
                        node at (1,-1) [circle,draw] (a2) {16};
                        node at (-1,-1) [circle,draw] (a3) {50};
                        node at (-2,-2) [circle,draw] (a4) {55};
                        draw (a1) -- (a2);
                        draw (a1) -> (a3);
                        draw (a3) -> (a4);
                    end{tikzpicture}
                end{minipage}
                begin{minipage}{0.4textwidth}
                    begin{tikzpicture}
                    node at (0,0) [circle,draw] (a1) {19};
                    node at (2,-1) [circle,draw] (a2) {20};
                    node at (-2,-1) [circle,draw] (a3) {25};
                    node at (-1,-2) [circle,draw] (a4) {28};
                    node at (-1.5,-3) [circle,draw] (a5) {32};
                    node at (-0.5,-3) [circle,draw] (a6) {93};
                    node at (1,-2) [circle,draw] (a7) {89};
                    node at (0.5,-3) [circle,draw] (a8) {99};
                    draw (a1) -> (a2);
                    draw (a1) -> (a3);
                    draw (a3) -> (a4);
                    draw (a4) -> (a5);
                    draw (a4) -> (a6);
                    draw (a2) -> (a7);
                    draw (a7) -> (a8);
                    end{tikzpicture}
                end{minipage}
            };
            node at (-3,-1) [circle,draw] (b) {9};
            node at (-4,-2) [circle,draw] (b1) {17};
            node at (-5,-3) [circle,draw] (b2) {19};
            node at (-2,-2) [circle,draw] (b3) {26};
            draw (a) -- (c);
            draw (a) -- (b);
            draw (b) -- (b1);
            draw (b1) -- (b2);
            draw (b) -- (b3);
    end{tikzpicture}
end{document}

This yields precisely

John Kormylo · Answer

This shows how to put an entire tikzpicture into a node.  Not sure how to put that node into a tree.
documentclass[12pt, letterpaper, oneside]{article}
usepackage{tikz}
begin{document}
begin{center}
sbox0{begin{tikzpicture}[nodes={draw, circle, fill=gray!20}]
        node{19}
            child {node{25}
                child[missing]
                child{node{28}
                    child {node{32}}
                    child {node{93}}
                }
            }
            child [missing]
            child[missing]
            child {node{20}
                child{node{89}
                    child{node{99}}
                    child[missing]
                }
                child[missing]
            };
    end{tikzpicture}}
    begin{tikzpicture}
        node[draw, rectangle, rounded corners] {usebox0};
    end{tikzpicture}
end{center}
end{document}

How do I draw a tikzpicture inside of a child node of another tikzpicture?

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