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HTML

            
              <body>
    <div id="wrapper">
      <div id="root-left">
          <div class="branch-inverse l1">
            <div class="entry-inverse"><span class="label-inverse">Parent 1</span>
              <div class="branch-inverse l2">
                <div class="entry-inverse"><span class="label-inverse">Grand Parent 1</span>
                  <div class="branch-inverse l3">
                    <div class="entry-inverse sole"><span class="label-inverse">Grand Grand Parent 1</span></div>
                  </div>
                </div>
                <div class="entry-inverse"><span class="label-inverse">Grand Parent 2</span></div>
              </div>
            </div>
            <div class="entry-inverse"><span class="label-inverse">Parent 2</span>
              <div class="branch-inverse l2">
                <div class="entry-inverse sole"><span class="label-inverse">Grand Parent 1</span></div>
              </div>
            </div>
          </div>
      </div>
      <div id="main-root"><span class="label">Root</span></div>
      <div id="root-right">
        <!-- <span class="label">Root</span> -->
          <div class="branch l1">
            <div class="entry"><span class="label">Child 1</span>
              <div class="branch l2">
                <div class="entry"><span class="label">Grand Child 1</span></div>
                <div class="entry"><span class="label">Grand Child 2</span></div>
              </div>
            </div>
            <div class="entry"><span class="label">Child 2</span>
              <div class="branch l2">
                <div class="entry"><span class="label">Grand Child 1</span></div>
                <div class="entry"><span class="label">Grand Child 2</span>
                  <div class="branch l3">
                    <div class="entry sole"><span class="label">Grand G Child 1</span></div>
                  </div>
                </div>
              </div>
            </div>
          </div>
        </div>
    </div>
</body>
!

CSS

            
              body, html {
    height: 100%;
    width: 100%;
}

*, *:before, *:after {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}

#family-graph {
  width: 100%;
  height: 100%;
}

#wrapper {
  margin-top: 50px;
  position: relative;
}

#root-left {
  position: relative;
  display: table-cell;
  vertical-align: middle;
}

#root-right {
  position: relative;
  display: table-cell;
  vertical-align: middle;
}

#main-root {
  position: relative;
  display: table-cell;
  vertical-align: middle;
  min-width: 150px;
}

/*right tree*/
.branch {
  position: relative;
  margin-left: 250px;
}


.branch:before {
  content: "";
  width: 50px;
  border-top: 2px solid magenta;
  position: absolute;
  left: -100px;
  top: 50%;
  margin-top: 1px;
}

.entry {
  position: relative;
  min-height: 60px;
  display: block;
}

.entry:before {
  content: "";
  height: 100%;
  position: absolute;
  border-left: 2px solid black;
  width: 50px;
  left: -50px;
}

.entry:after {
  content: "";
  width: 50px;
  border-top: 2px solid aqua;
  position: absolute;
  left: -50px;
  top: 50%;
  margin-top: 1px;
}

.label {
  display: block;
  min-width: 150px;
  padding: 5px 10px;
  line-height: 20px;
  text-align: center;
  border: 2px solid silver;
  border-radius: 5px;
  position: absolute;
  left: 0;
  top: 50%;
  margin-top: -15px;
  overflow-wrap: break-word;
  background-color: lightblue;
}

/* left tree  */
.branch-inverse {
  position: relative;
  margin-right: 250px;
}

.branch-inverse:before {
  content: "";
  width: 50px;
  border-top: 2px solid magenta;
  position: absolute;
  right: -100px;
  top: 50%;
  margin-top: 1px;
}

.entry-inverse {
  position: relative;
  min-height: 60px;
  min-width: 150px;
}

.entry-inverse:after {
  content: "";
  width: 50px;
  border-top: 2px solid aqua;
  position: absolute;
  right: -50px;
  top: 50%;
  margin-top: 1px;
}

.entry-inverse:before {
  content: "";
  height: 100%;
  border-right: 2px solid black;
  position: absolute;
  right: -50px;
}

.label-inverse {
  display: block;
  min-width: 150px;
  padding: 5px 10px;
  line-height: 20px;
  text-align: center;
  border: 2px solid silver;
  border-radius: 5px;
  position: absolute;
  right: 0;
  top: 50%;
  margin-top: -15px;
  overflow-wrap: break-word;
  background-color: lightblue;
}
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