flowchart LR
%% Colors %%
classDef blue fill:#66deff,stroke:#000,color:#000
classDef green fill:#6ad98b,stroke:#000,color:#000
%% GENERATION 4 %%
Fa1(Grandfather):::green --> G3(Gen 3):::blue
Mo1(Grandmother):::green --- G3
%% GENERATION 3 %%
G3 --> U1(First Sibling)
G3 --> U2(Second Sibling)
G3 --> Fa(Father):::green --- G2(Gen 2):::blue
Mo(Mother):::green --- G2
G3 --> U4(Fourth Sibling)
%% GENERATION 2 %%
G2 --> S1(First Sibling)
G2 --> Or(Root Person):::green
Or --- G1(Gen 1):::blue
Sp(Spouse) --- G1
G2 --> S3(Third Sibiling)
G2 --> S4(Fourth Sibling)