for each additional field you are adding you are using the name "Phone_Number"
<label>
Boy and/or Girl<br />
<input type="text" name="Phone_Number" id="phone_number" />
</label>
each form element must have a unique name and ID:
<label>
Boy and/or Girl<br />
<input type="text" name="Boy_and_Girl" id="Boy_and_Girl" />
</label>