Now, the latest in the investigation into allegations surrounding former President Lee Myung-bak's connection to auto-parts company DAS,... and its suspicious business activities.<br />Prosecutors called in Lee's son in for questioning on Sunday-- asking him about the ownership of the company, and rumors of a secret slush fund.<br />After his son, the ex-president may be summoned for questioning soon.<br />Park Hee-jun reports. After concluding that DAS-- an auto parts company involved in suspicious trade and allegations of embezzlement-- belongs to ex-president Lee Myung-bak,... prosecutors are closing in on his family members.<br /><br /> Prosecutors summoned the former President's son Lee Si-hyung-- the executive of DAS,... over rumors about who actually owns the company, and allegations that the company had a secret slush fund.<br />During 16 hours of questioning at the Seoul Central District Prosecutors' Office on Sunday,... Lee was asked whether he took a 930-thousand dollar portion of the 14-million dollar proceeds from the sale of land in Dogok-dong, southern Seoul.<br /><br /> Lee Myung-bak is believed to have managed hundreds of thousands of dollars in slush funds through DAS.<br />His son, brother, and nephew are all either representatives or board members of the company,... which has been under scrutiny since 2007 when Lee won the presidential election.<br /> Documents show that his brother Lee Sang-eun is the president,... however civic activists and lawyers have been claiming the former president is the unknown, actual owner of the company - and that he embezzled some eleven million dollars of company money and evaded taxes.<br />The investigation has been ongoing since December, and prosecutors are planning to summon Lee Myung-bak early next month.<br /><br />Park Hee-jun, Arirang News. <br />