Mr. Sawatari is Izumi's, Mitsuki's, and Karin's father. His given name is unknown.     Upon hearing the rumors of Yoshitaka, he immediately approached the mansion to demand the return of Izumi and Mitsuki. All his attempts at retrieving Izumi and Mitsuki fail, usually when his wife, Mizuho, abruptly stops him.    Like Yoshitaka, Mr. Sawatari is a lolicon pervert, although he wishes to &quot;not be put in the same category.&quot; Mr. Sawatari is highly attracted to his three daughters in a perverted way (seemingly stronger when the girls dress up). Izumi has even once said &quot;I've seen how you look at us!&quot; referring to herself and Mitsuki.       (Wikipedia.org)  [Edited by Tiamat]

Izumi Sawatari and her younger sister, Mitsuki Sawatari, have run away from home and are in need of employment. The only jobs available are as maids in the mansion of 14-year-old millionaire, Yoshitaka Nakabayashi. What seems like simple work is soon revealed to be far more than the girls bargained for when they find Yoshitaka to be an authoritative employer who demands they call him "Master". <br><br>
(Source: Sentai Filmworks) 

His name is sometimes mistranslated as Matsumoto Hiroshi.

Yoshitaka Nakabayashi, a 14-year-old millionaire who got this huge inheritance after his parents died in an accident, found himself needed to be taken care of and tried to hire live-in maids to do the job. Two runaway girls, Izumi Sawatari and her younger sister Mitsuki, stumped into Nakabayashi's mansion and got hired by Yoshitaka immediately, for Yoshitaka is not only a rich boy but also a pervert with uniform fetishes, who wants to be addressed as goshujin-sama (master). Having nowhere else to settle down along with Mitsuki's pet alligator Pochi, Izumi accepted the job reluctantly.
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(Source: Anime News Network)

Father Sawatari